Diastereocontrolled nickel(0)- and palladium(0) catalyzed “metallo-ene-type” cyclizations/carbonylations
作者:Wolfgang Oppolzer、Thomas H. Keller、Manuel Bedoya-Zurita、Charles Stone
DOI:10.1016/s0040-4039(01)93496-3
日期:1989.1
Treatment of 1-iodoacetoxy}-2,7-octadienes and 1-iodoacetoxy}-2-en-7-ynes with Ni(COD)2/dppb (THF/MeOH) or Pd(dba)2/PPh3 (AcOH, then CH2N2) under carbon monoxide furnished chemo- and stereoselectively either bicyclic ketoesters (from ) and (from ) or trans-substituted monocyclic products (from ) and (from ), but all-cis-hexahydroindole (from acetoxycyclohexene .
Palladium-catalyzed intramolecular alkyne-carbon monoxide-alkene insertion cascade for synthesis of .alpha.-methylenecyclopentenones
作者:Nathan C. Ihle、Clayton H. Heathcock
DOI:10.1021/jo00055a006
日期:1993.1
A method for the construction of alpha-methylenecyclopentenones fused to five-membered rings using a palladium catalyst is reported. The procedure involves the formation of pi-allylpalladium intermediates that undergo sequential intramolecular alkyne insertion, carbon monoxide insertion, intramolecular alkene insertion, and beta-hydride elimination. Examples of the cyclization are seen in eq 2 and Scheme III.
OPPOLZER, WOLFGANG;KELLER, THOMAS H.;BEDOYA-ZURITA, MANUEL;STONE, CHARLES, TETRAHEDRON LETT., 30,(1989) N3, C. 5883-5886
作者:OPPOLZER, WOLFGANG、KELLER, THOMAS H.、BEDOYA-ZURITA, MANUEL、STONE, CHARLES